Is it possible to make bones not show "In Front" of everything when in Pose Mode?
Are you sure you unchecked BOTH &quot;In Front&quot; options?
Unless 2.9 has changed in that aspect relative to 2.82, you should have one in the Armature tab and one in the Object tab.

Either way, supposing it's a bug or something weird that you can't fix, you can always duplicate your viewport window and Uncheck Overlays - it removes the bones and leaves only the mesh so you can fiddle with the armature on the original window, and look at the other without any clutter, in real time.